There's no fork. As you know, Tron is an existing chain that's worth 17x as much as Steem. They are just moving everything from the Steem chain to the Tron chain. They have their own witnesses, they don't need Steem witnesses. Of course, timing is uncertain, but there might be an interim while they still support the current chain, but the goal is clear. Abandon current Steem chain, move everything to Tron chain.

All they need is exchange support for the swap. Poloniex has already announce the swap to TRC STEEM. The money will follow.